US Bridges

I40 Lf LN over SR 29

Fair

Roane County, Tennessee · 1.7 M SE JCT I40&SR61 · Structure no. 73I00400008

Built
1970
55 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
125 ft
3 main spans
Daily traffic
36,375
2021 count
Owner
State
State Highway Agency

About this bridge

I40 Lf LN over SR 29 is a prestressed concrete continuous stringer/multi-beam or girder carrying I40 Lf LN over SR 29 in Roane County, Tennessee. It was built in 1970, so it is 55 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 36,375 vehicles a day, roughly 6% of them trucks, projected to reach 58,200 by 2042. The structure is 125 ft (38.1 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI40 Lf LN
CrossesSR 29
Location1.7 M SE JCT I40&SR61
RouteInterstate 40
CountyRoane County
StateTennessee
Coordinates35.90125, -84.56065
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length125 ft (38.1 m)
Longest span42 ft (12.8 m)
Deck width45 ft (13.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,375 (2021)
Projected traffic58,200 by 2042
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I40 Lf LN over SR 29 built?

It was built in 1970, making it 55 years old in 2025.

What condition is I40 Lf LN over SR 29 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does I40 Lf LN over SR 29 carry?

About 36,375 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is I40 Lf LN over SR 29?

The structure is 125 ft (38.1 m) long with a longest span of 42 ft (12.8 m) and a deck 45 ft wide.

Who owns I40 Lf LN over SR 29?

It is owned by the State Highway Agency.